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The co rre lation radiometer is analyzed to determine the sensitivity that can be obtained under various o perating conditions.The rad iometer using a s in e wave compariso n signal is analyzed and compared with the usual radiometer that e mploys a random noise for the co mparison s ignal. Tt is found that the radiometer e mployin g the s in e wave compariso n s ignal is the more sf' ns itiv e of th e two circuits, particu larly in the c ase that the effe ct ive tem pe rature of th e input noi se signal is greater than th e effec tive input temperature of the amplifiers. It is s hown that if nonidenti cal ampl ifi ers are used in th e co rre lation circuit, th e prope rties of the rad iometer are det ermin ed by th e portion of the amplifi e r res pon se fun cti ons in the frequency interv al th at th e two res ponse functions ove rl a p. Th .. effect of amp lifi er ga in flu c tu ati ons are cons id e red. a nd although the corre lat ion sc heme red uces the e ffec t of ga in flu c tuati ons, it is s hown th at th ey st ill d o co ntribut e to the output Au c tu ati ons of the ra di ome ter.Ca lc ul a ti ons a re included show in g that th e e ffec t of a diffe re ntial phase s hift betwee n the tw o c han· nel s is a reduction in radiometer se nsi tivity . Th e same co nc lu s ion is reached co ncerning the effect of a diffe re ntial t ime de lay.Fina lly. it is s ho wn th at if the co mparison s ignal and the input s ignal have the same statistical properties, th e req uire me nt s o n th e multipli er ar .. le ss strin ge nt th a n if the two s ignal s have different s tati s ti c al properties.Ke y Word s: Corre la tio n radiom e ter, diffe rential tim e de lay, ga in flu c tuations, imperfec t multipli e r , noi se comparison, noni de ntic al a mplifie rs, s in e-wave comparison signal.

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